Protective apparatus



March '9 1 926.

. N. J. CONRAD PROTECTIVE APPARATUS Filed May 24. 1920 2 Sheets-Sheet 1 r (Zn/ad March 9 1926. 1,575,736

' 'N. J. CONRAD I PROTECTIVE APPARATUS Filed May 24, 1920 2 Sheets-Sheet 2 CZ/5 J amp/ ad Patented Mar. 9, 1926.

UNITED STATES NICHOLAS J. CONRAD, OF WILME'I'TE. ILLINOIS, ASSIGNOR TO SCHWEITZER & CONRAD,

PATENT oFF cE.

OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PROTECTIVE APPARATUS.

Application filed May 24, 1920. Serial No. 883,822.

To all whom it nut-y concern:

Be it known that I, NICHOLAS J. CONRAD,

a citizen of the United States, residing. at-

. concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification,

My. invention relates to protectiv'e apparatus and has for its object the provision of an improved self-contained unit which combines in a unitary structure, various in strumentalities necessary to afford complete protection for an electric circuit. In particular my invention is of use in connection with high tension equipment.

In one form which my invention may take, it is of use in connection with the provision of power for isolated users along a high tension transmission line. In this connection it may be pointed out that the invention would be ofutilityfor the protection of subcircuits which are taken ofi' the high tension transmission lines and which sub-circuits are utilizedvto supply power to farms or other tained unit so that comparatively unskilled labor may be utilized in making the .neces-' sary connections.

My invention also has other features, all of which together with those enumerated. 'will'be more clearly apparent from the 'construction which I will now describe in connection with theaccompanying drawings illustrating one form which my invention may take in which 1 Fig. 1 is a side view of "a protective unit constructed in accordance with my invention, the two cross arms of the pole upon which the device is mounted being also shown;

cFig. 2' is a view showing the device in placetoge'ther with the connections;

Fig. 3 is :a front view of the apparatus shownin' Fig. 2: i

ties to cor Fig. 4 is a view similar to 1 of a modified form of the invention; and

Fig. 5 is a modified form of a portion of the apparatus.

Referring more particularly to Figs. 1, 2 and 3, I show a pole 10 which carries at its upper portion a cross arm 11 having insulators 12, 13 and 14. These insulators support a high tension transmission line indicated by the conductors 15. Such transmission lines frequently utilize voltages up to 25,000 volts or higher. The pole is also provided with additional cross arms 16 and 17 i which cross arms are adapted to support my improved unitary structure, one unit of which is illustrated in side view in Fig. 1.

The pole also supports a transformer 18 and the secondary windings of this transformer supply current to the sub-circuit which, in this instance, is shown as athree conductor sub-circuit having the conductors 19, 20 and 21. The sub-circuit consisting of the conductors 19, 20 and 21, of course has a low service voltage so that it may be safely utilized by consumers. Such consumers are now found to a. large extent, along the rights of way of high tension lines.

My improved protective equipment is included in the circuit between the high tension transmission line consisting of the conductors 15, and the transformer 18. I have found it desirable in practice, to use one unit such asillu'strated in Fig. 1, for each conductor of the high tension transmission line- Thus, if a single phase circuit is to be taken off of the high tension transmission line two units will be used and two units are illustrated as being used in Figs. 2 and 3. If

a three phase circuit is to be taken from the high tension transmission line, three units such as the one shown in Fig. 1 would be utilized. I

By referring now more particularly to Fig. 1, the arrangement of my in'iproved units will be more readily understood.- The unit itself consists in art of a framework having the U shaped ar 22 which is the part of the device by means of which it is mounted upon the cross arms 16 and 17.

This U shaped bar is secured at its extremigated ins'ulators23 and24. I

have found in practice that I obtain exceptional results in this connection by the use of insulators such as tho e shown harem.

The insulators are especially designed for this service and the arrangement is such 'that the corrugations of the insulators supvery severe rain conditions have'shown conclusively that the leakage current, with the use of these insulators in this connection. is no greater than that of the most liberally designed pin type insulators mounted horizontally or at an angle of 45 degrees. The

inner ends of the insulators 23 and 24 are secured to'arms 25 and 26 respectively, the free ends of said arms being used for supporting certain parts of the protective apparatus as will presently appear. The distance piece 27 between the arms 25 and 26, is sufficient to provide a rigid framework for the entire structure. The free extremity of the arm 25 has a'spring clip 28 which supports an enclosed fuse 29, the other extremity of which is held'by a spring clip 30 carried by 'abracket 3lsecured to the outer extremity of the insulator 23. The free extremity of the arm 26 supports one extremity of an impedance coil 32, the opposite extremity of which is held by a bracket 33 secured to the right hand end of the insulator 24. This bracket 33 also has metallic posts 34 pivotally supporting a switch blade 35. The framework 22 supports a further corrugat-ed insulator 36 which insulator carries a bracket 37. This bracket has switch jaws 38 adapted to (Bo-operate with the pivoted switch blade 35. The switch blade has at its upper extremity, a socket or receptacle or hole 39 to which means may be applied for opening or closing the switch. The framework 22 supports a further corrugated insulator 40 and this insulator carries one prong 41 of a horn gap lightning arrester, this prong forming part of a bracket 42, the opposite extremity of the bracket being bent to support a spring clip 42". The spring" clip 42' removably holds in place a resistance rod 43, the opposite extremity of which is held in a spring clip 44 carried by a. bracket 45 mounted upon the framework 22. The other prong 46 of the horn gap arrester is mounted upon a slidable' bar which is adjustably supported upon the bracket 37 through the agency ofthe clamp 48. By thus constructing the lightning arrcster parts 41 and 46'it will be seen that a proper adjustment 'can'be made for different voltages and circuit conditions. The bracket 37 has a socket connector 49 adapted to receive a conductor extending from the high tension transmission line. The bracket 31 has a. socket connector 50 adapted to receive a conductor which extends to the 'pr1- may winding of the transformer 18. There by way of conductor 51 to the connecting terminal 49, thence by way of bracket 37 and switch blade 35 to the impedance coil 32 and thence by way of the conducting strip 52 to the fuse 29 and thence by way of the conductor 50 to the primary wind ing of the transformer. rod 43 is used for the purpose of preventing a short circuit on the high tension trans mission line in case of severe arcing across The resistance the prongs 41 and 46 of the lightning ar-;.-:;

rester. The impedance coil 32 is used for the purpose of protecting the transformer against high frequency surges.

The extreme simplicity of the structure will be readily apparent. It will also be noted-that there is a very small amount of metal used throughout. The partsarc all accessible and the entire structure is so arranged that it can beeasily mounted in position. It is, of course, necessary that means i be provided to open the switch blades 35 from some point remote so that the operator will not be injured in case an arc of any serious proportions is formed, and to this end the hole 39 provided at the upper extremity of the switch blade 35 may serve s0 that the attendant may, by the use of a long pole having 9. prong, insert this prong in the hole 39 to thus manipulate. the switch blades. A means of operating the switch arms, however, which I have found very desirable, is shown in Figs. 2 and 3 wherein a cross bar 53 is employed which has its extremities fastened in two insulators 54 and 55 respectively, the opposite extremities of these insulators being fastened to the switch blades 35 through the agency of the.

bolts passed through the holes 39. An operating rod 56 is fastened to the cross bar 53 and serves to manipulate the same, suitable eyelets 57 and 58 being provided for the opposite extremity of this rod wherein it n1ay be locked by a pad-lock or other suitable means so as to lock the switches either in their open or closed position. A precautionary ground connection 59 is provided to limit the movement of the switch blades and also to effect a ground connection for the operating rod so as to insure the o erator against shocks. The framework 22 a so has a ground-connection terminal 60 so that-the discharge across the prongs 41- and 46 may be safely led away to the ground.

, fuse 29.

v I Q, The cross bar 53 is, of course, insulated from the switch blades as explained.

In Fig. 4 I show a somewhat modified form of structure in. that the distance piece .27 is omitted and the unit somewhat narrowed so that it may be moimted upon one cross arm here shownas the cross arm 16.

This narrowing of the structure makes. it

there'being shown here a switch blade 35? which, however, is ma e of insulating material and which carries spring clips 61 and 62 which are adapted to receive the enclosed In this manner, the device may be .still'further simplified. It may also be pointed out that t e structure combining the fuse and carrying blade has uses other than illustrated herein Fromwhat has been thus "described, thenature of m invention will be readily clear to those ski ed in the art and it Wlll also be readily apparent that many modifications may be made of the structure herein -disclosed without departing from the spirit of my invention.

the

Having, however, thus described one form; which my'invention may take, ;what I'claim as new and desire to secure by Letters Patent is f 1. -:A self contained protector unit com prisingI an angular supporting bracket'havmg a orizontall extending portion adapted-to engage a c oss arm and vertically extending portions depending therefrom, a plurality of electrical devices mounted on said bracket, said devices comprising a switch, an enclosed fuse, and a lightning arrester, and insulating members extending outwardly from saidibracket and supportin said devlces said insulating members an devices being arranged about the bracket to follow theeneral outline thereof and oerdevices depending below said tain of "sai bracket whereb a minimum amount of space is require for said unit.

2. The combination with a cross arm, of

a protector unit comprising across arm engaging supporting bracket having a pair of }parallel vertically extending1 arms, and a orizontal arm connecting t e upper ends thereof, insulators projecting laterally from said vertical arms, electrical devices mount cd'on said insulators, and a supporting member dependin below said bracket between lanes 0 said vertical arms for supporting portions of said electrical devices. A In witness whereof, I hereunto subscribe 20th day of May A. D., 1920. NICHOLAS J. CONRAD.

my name this 

